CN110151285A - A double-head base multi-angle plane adjustment spinal internal fixation system - Google Patents

Abstract

The invention discloses a double-head base multi-angle plane adjustment spinal internal fixation system, comprising: a plurality of bases, the base includes at least one double-head base, the double-head base includes a U-shaped groove installation base, Closed-loop hole mounting base and ball studs; ball studs are set between the U-shaped groove mounting base and the closed-loop hole mounting base, and the tail of the ball stud is provided with threads, which are connected to the side of the closed-loop hole mounting base. The thread in the screw hole is fixed; the head of the ball stud bolt is a ball head, and the U-shaped groove mounting base can rotate around the ball head in a frictional damping direction. This internal fixation device is suitable for the fixed connection of the special complex state in the internal fixation of the spine. The universal rotation combination design of the U-shaped groove mounting base and the closed-loop hole mounting base can realize the fixed connection of the universal angle on different planes; The design of the ball head of the pedicle screw head increases the choice of multiple angles when the complex state is fixed and connected during the operation.

Description

A double-head base multi-angle plane adjustment spinal internal fixation system

technical field

The invention relates to a medical device for orthopedic surgery, in particular to a double-head base multi-angle plane adjustment spinal internal fixation system.

Background technique

The fixation technology of the lumbosacral pelvis has always been a research hotspot and difficulty in the field of spinal surgery, especially how to improve the stability of internal fixation, and the application of iliac screw and lumbar pedicle screw-rod connection system technology to maintain the stability of the lumbosacral pelvis The effect is better, but due to the large deviation of the fixation device between the ilium and the lumbar spine, the situation is complicated and special, and it is often necessary to fix the internal fixation on different angle planes to meet the connection and fixation. Currently, most of the fixation bases used in the market are fixed on a single plane. However, it cannot meet the special and complicated needs in the operation. In the face of this situation, excessive bending of the rod is usually performed to achieve a suitable angle, and excessive bending of the rod often causes stress concentration, which makes the orthopedic rod easy to break; at the same time, this kind of base is used When the connection is fixed, the pedicle screw and the base are not pre-locked during the operation, and there is relative movement between them. The pre-selected angle of the base cannot be fixed, which will bring some troubles to the further insertion of the orthopedic rod, and the placement of the rod It is difficult to adjust the rear angle to a suitable angle position. Similarly, if the excessive bending rod is adjusted to a suitable angle, the stress concentration of the excessively bending rod will be caused, and the orthopedic rod will be easily broken. In addition, not only the connection and fixation of the lumbosacral part is complex and special, but also the connection and fixation of the occipital neck and thoracic spine is often more complicated, often requiring the use of different types of orthopedic rods and fixed connections with different plane angles. Therefore, there is a need for an internal fixation device that can overcome the above-mentioned shortcomings and meet special conditions at the same time.

Contents of the invention

The purpose of the present invention is to provide a double-headed base multi-angle plane adjustment spinal internal fixation system to overcome the above-mentioned defects in the prior art in view of the above-mentioned shortcomings, and provide a comprehensive solution for the sacroiliac and lumbar vertebrae, neck and thoracic vertebrae. In complex and special cases, multi-angle plane connection and fixation are provided, which reduces the bending rod during operation, reduces the chance of orthopedic rod breakage, and reduces operation time. Operate the installation.

In order to solve the above problems, the technical solutions provided by this patent include:

A double-head base multi-angle plane adjustment spinal internal fixation system is characterized in that it includes:

A plurality of bases, the base includes at least one double-head base, the double-head base includes a U-shaped groove installation base and a closed-loop hole installation base; the U-shaped groove installation base and the closed-loop hole Ball stud bolts are arranged between the installation bases, and the tails of the ball stud bolts are provided with threads, which cooperate with the threads in the screw holes on the side of the closed loop hole installation base; the head of the ball stud bolts is a ball head, and the U-shaped The groove installation base can rotate universally around the frictional damping of the ball head.

The orthopedic rod includes a first orthopedic rod and a second orthopedic rod, the first orthopedic rod and the second orthopedic rod; one end of the first orthopedic rod is fixedly connected to the closed-loop installation hole on the double-ended base, and the second orthopedic rod One end of the rod is fixedly connected with the U-shaped groove installation base.

Preferably, the U-shaped groove installation base includes a U-shaped groove, the opening of the U-shaped groove is set upward, and a circular through hole is arranged at the bottom of the U-shaped groove; the tip of the pedicle screw is connected from the The U-shaped groove protrudes from the circular through hole, and the head of the pedicle screw cooperates with the ball and socket at the bottom of the U-shaped groove, allowing the pedicle screw to move relative to the U-shaped groove. The circular through hole can rotate universally.

Preferably, in the U-shaped groove, the top of the pedicle screw fits with a retaining ring, the retaining ring is a cylindrical structure, and U-shaped openings are opened on the front and rear sides of the upper end of the cylinder , the U-shaped opening allows the orthopedic rod to pass through and support and fix the orthopedic rod; the middle part of the inner wall of the retaining ring is provided with a protrusion, and the protrusion is matched with the top end of the pedicle screw, and the The tip of the pedicle screw is pressed and held in a predetermined position, thereby fixing the position of the pedicle screw.

Preferably, the notch of the U-groove installation base is provided with internal threads; the outer locking screw plug is a cylindrical plug with threads on both the inner wall and the outer wall, and the threads on the outer wall are in line with the described The inner thread provided in the notch cooperates, and the retaining ring is pressed against the ball head of the pedicle screw by rotating the outer locking screw plug, thereby fixing the position of the pedicle screw; the inner thread of the outer locking screw plug The thread cooperates with the thread on the outer circumference of the inner locking screw plug, so that the inner locking screw plug is tightened to press the orthopedic rod arranged on the retaining ring, thereby fixing the position of the orthopedic rod.

Preferably, a closed-loop installation base is provided with a closed-loop installation hole, and the closed-loop installation hole forms a closed loop as a whole and is set through the front and rear directions of the closed-loop hole installation base. It is matched with the surface of the orthopedic rod; a through hole penetrating up and down is arranged on the top of the closed-loop installation hole, and a screw plug is installed in the through hole.

The double-head base multi-angle plane adjustment spinal internal fixation system of the present invention, the universal rotation combined design of the U-shaped groove installation base and the closed-loop hole installation base can realize the fixed connection at different plane universal angles; The ball head design of the screw can make the double-headed screw seat realize the overall universal rotation, further increasing the flexibility of the installation angle selection of the whole fixing device; the double locking screw plug locks the pedicle screw and the orthopedic rod step by step, taking the lead The positions of the pedicle screw and the U-shaped groove installation base are relatively fixed, and then the angle of the installation base of the closed-loop hole can be adjusted arbitrarily to meet the complex situation in the operation, and then the rod is placed and the orthopedic rod is locked. In order to achieve the above three purposes, the present invention provides a double-headed base multi-angle plane adjustment spinal internal fixation device, which consists of double-headed bases, pedicle screws, retaining rings, orthopedic rods, double locking screw plugs, screw plug composition. The double-head base includes a U-shaped groove mounting base, a closed-loop hole mounting base and a ball stud, and the U-shaped groove mounting base has a U-shaped mounting groove, a pedicle screw mounting hole, and a ball stud mounting hole , the closed-loop hole mounting base has a closed-loop mounting hole, a screw threaded hole and a ball stud threaded hole, the ball stud has a ball head structure and a tail thread, and the U-shaped groove mounting base and the closed-loop hole mounting base The seat is connected by a ball stud bolt. The tail of the ball stud bolt has a part of the thread, which can be connected and fixed with the installation base of the closed loop hole. The seat and the closed-loop hole mounting base are fixedly connected on different planes; the pedicle screw is matched with the pedicle screw mounting hole on the U-shaped groove mounting base, and the head of the pedicle screw is arranged with the lower part of the U-shaped mounting groove. Some ball and socket surfaces match and can rotate universally; the bottom of the retaining ring matches the cylindrical surface at the bottom of the U-shaped installation groove, and the upper teeth of the retaining ring mesh with the arc-shaped groove, and are placed on the bottom of the U-shaped installation groove. The pedicle screws are locked up and down; the orthopedic rods are respectively placed in the U-shaped mounting groove and the closed-loop mounting hole; the double locking screw plugs include an outer locking screw plug and an inner locking screw plug, and the double locking screw plugs It can be locked step by step. The outer locking screw plug can pressurize and lock the pedicle screw at first, and at the same time lock the U-shaped groove mounting base and the closed-loop hole mounting base. The inner locking screw plug locks the orthopedic rod, which is convenient Intra-operative installation.

Description of drawings

The present invention is further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of the split structure of the present invention.

Fig. 2 is a schematic diagram of the initial structure of the combined assembly of the present invention.

Fig. 3 is a schematic cut-away view of the initial structure of the combined assembly of the present invention.

Fig. 4 is a schematic diagram of the structure of the four transition states of the double-headed base of the present invention, Fig. 4a. is the view of the original position, 4b. the top view of the rotation position, 4c. the side rotation position, and 4d. the mixed rotation position.

Fig. 5 is a schematic diagram of the initial structure of the combination of the double-headed base and the double-screw plug of the present invention, 5a. an appearance structure diagram, and 5b. a cut-away structure diagram.

Fig. 6 is a schematic diagram of connection methods that can be used in the operation of the present invention.

The marks in the figure are listed as follows: 1. Double-headed base, 11. U-shaped groove mounting base, 12. Closed-loop hole mounting base, 13. Ball stud, 2. Pedicle screw, 3. Retaining ring, 4. , orthopedic rod, 5, double locking screw plugs, 51, outer locking screw plugs, 52, inner locking screw plugs, 6, screw plugs.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them.

It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner ", "outside", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only, and should not be construed as indicating or implying the relative importance between the objects modified by these terms.

As shown in FIG. 6 , this specific embodiment provides a multi-angle plane-adjustable spinal internal fixation with a double-headed base, and the system includes multiple bases.

As shown in FIG. 6 , for example, it includes a first base, a second base 1 and a third base, the base overall presents a block shape, and pedicle screws 2 are arranged on all bases. The pedicle screw is used for fixed connection with the spine, and fixes the double-head base multi-angle plane adjustment spinal internal fixation system on the spine.

In the embodiment shown in FIG. 6 , the setting structure of the pedicle screw 2 on the base includes two forms: for example, the first base on the far left as shown in FIG. 6 , and the third base on the far right. The base, both of which include a U-shaped groove, can be set to the same structure. The opening of the U-shaped groove is set upwards, and a circular through hole is arranged at the bottom of the U-shaped groove, and the tip of the pedicle screw extends out of the U-shaped groove 11 from the circular through hole. , and through the screw thread on the nail body, it is fixed with the spine, thereby setting the base on the spine. The pedicle screw is matched with the mounting hole of the pedicle screw on the base, and the head of the pedicle screw is matched with the ball-and-socket surface provided at the bottom of the U-shaped mounting groove, and the pedicle screw can be rotated universally to Satisfying internal fixation at different angles; the U-shaped groove is provided with a retaining ring, the bottom of the retaining ring matches the cylindrical surface at the bottom of the U-shaped groove, and the upper teeth of the retaining ring mesh with the arc-shaped groove, and are placed at the bottom of the U-shaped groove And lock the pedicle screws up and down; the orthopedic rods are respectively placed in the U-shaped installation groove and the closed-loop installation hole, and the locking screw plug and the threaded teeth of the locking screw plug cooperate to lock the orthopedic rod to prevent the orthopedic rod from coming out Phenomenon. The base of only one orthopedic rod mounting position is provided, and the structure of its U-shaped groove can use the structure in the prior art, which will not be discussed in detail in this specific embodiment. Of course, as a preference, a U-shaped groove based on a base including two orthopedic rod installation positions described next in this specific embodiment may also be used. This can increase the installation position of an orthopedic rod if necessary, thereby improving the flexibility of the device.

On the double-headed base in the middle position shown in Figure 6, two orthopedic rod installation positions are set, and a U-shaped groove installation base 11 and a closed-loop hole installation base are included in the two orthopedic rod installation positions 12. The structure of the second base is shown in Figures 2 and 3 .

The U-shaped groove installation base 11 is set separately from the closed-loop hole installation base 12, and a ball stud 13 is arranged between the U-shaped groove installation base 11 and the closed-loop hole installation base 12, and the ball stud 13 The tail part is provided with a partial thread, which cooperates with the thread in the screw hole on the side of the closed-loop hole mounting base. The head of the ball stud 13 is a ball head, and the U-shaped groove installation base 11 can rotate around the ball head in a frictional damping direction. The U-shaped groove mounting base 11 and the closed-loop hole mounting base 12 are connected side by side through the ball studs, so that the U-shaped groove mounting base and the closed-loop hole mounting base can be located on different planes. They can also be fixedly connected to each other, so that the angle between the two installation positions in the same installation base can be designed according to the required radian, thereby improving the angle range formed by the orthopedic rod.

The angle adjustment between the U-shaped groove mounting base 11 and a closed-loop hole mounting base 12 is shown in Figure 4, the relative position between the U-shaped groove mounting base and the closed-loop hole mounting base of the double-headed base There are four states, namely the original position state, as shown in figure a; the top view rotated position state, as shown in figure b; the side rotated position state, as shown in figure c; the mixed rotated position state, as shown in figure d. Through the cooperation of the ball studs, a large adjustment space can be provided between the installation positions of the double orthopedic rods, so as to meet the angle adjustment requirements in various complicated situations.

The opening of the U-shaped groove is set upwards, and a circular through hole is arranged at the bottom of the U-shaped groove, and the tip of the pedicle screw extends out of the U-shaped groove from the circular through hole. And it is fixed with the spine through the screw thread on the nail body, thereby setting the base on the spine. The pedicle screw is matched with the mounting hole of the pedicle screw on the base, and the head of the pedicle screw is matched with the ball-and-socket surface provided at the bottom of the U-shaped mounting groove, and the pedicle screw can be rotated universally to It is suitable for internal fixation at different angles.

In the U-shaped groove, the top of the pedicle screw cooperates with the retaining ring 3. As shown in FIG. 1, the retaining ring 3 is a cylindrical structure, with There is a U-shaped opening for the orthopedic rod to pass through and to support and fix the orthopedic rod. The middle part of the inner wall of the retaining ring is provided with a protrusion, and the protrusion cooperates with the top end of the pedicle screw to press and maintain the top end of the pedicle screw at a predetermined position, thereby fixing the pedicle screw location.

In this specific embodiment, the notch of the U-shaped groove installation base is provided with internal threads, and the outer locking screw plug 51 is a cylindrical plug with threads on its inner and outer walls, and on the outer wall. The thread of the thread cooperates with the internal thread provided in the notch, and the positions of the pedicle screw and the ball stud are fixed by rotating the external locking screw plug 51 . The inner thread of the outer locking screw plug 51 cooperates with the thread on the outer circumference of the inner locking screw plug 52, so that the inner locking screw plug 52 is tightened to press the orthopedic rod arranged on the retaining ring, thereby fixing the inner locking screw plug 52. The position of the orthopedic rod is described. The outer locking screw plug and the inner locking screw plug can be locked step by step. The outer locking screw plug can pressurize and lock the pedicle screw at first, and at the same time lock the U-shaped groove mounting base and the closed-loop hole mounting base. The inner locking screw plug locks the orthopedic rod, which is convenient for operation and installation during operation.

In this specific embodiment, the closed-loop mounting base 12 is provided with a closed-loop mounting hole, and the structure of the closed-loop mounting hole is shown in Figure 1-3, which is set through the front and rear directions of the closed-loop mounting base as a whole. The upper end of the cross-section is larger and the lower end is smaller, and the lower end is arc-shaped to match the surface of the orthopedic rod, and the upper end is larger to facilitate the installation of the orthopedic rod. A through hole penetrating up and down is arranged on the top of the closed-loop installation hole, and a locking screw plug 6 is installed in the through hole. The locking screw plug cooperates with the thread teeth of the locking screw plug to lock the orthopedic rod, so as to avoid the prolapse phenomenon of the orthopedic rod. The closed-loop hole installation base is connected to the U-shaped groove installation base through ball studs, and the thread of the ball stud and the thread in the closed-loop hole installation base have a certain locking force, so that the closed-loop hole installation base can be connected to the U-shaped groove. The installation base frictionally damps the universal rotation. In this specific embodiment, the inner wall of the closed-loop installation hole is closed as a whole except for the through hole that penetrates up and down, forming a closed loop. The advantage of forming a closed loop is that even if the screw plug is loose, the orthopedic The stick is also difficult to get out of the base.

When the above-mentioned double-headed base is used, a typical intraoperative connectable fixation method of the fixation system in this specific embodiment includes: the pedicle screw first passes through the U-shaped groove and installs the vertebral arch on the base The root screw hole is fixed on the pedicle, and the external locking screw plug is inserted to lock the pedicle screw. The orthopedic rod first passes through the installation hole on the closed-loop hole installation base to connect with other nail seats, and adjusts the double-headed base as a whole. Choose a suitable angle and lock it with the locking screw; at this time, put the orthopedic rod into the pre-fixed other nail seat and the U-shaped groove installation base, and then turn the double-headed base to adjust to a suitable angle. The inner locking screw locks the orthopedic rod to achieve overall stable connection and fixation.

In this specific embodiment, the U-shaped groove mounting base can rotate universally around the frictional damping of the ball stud bolts, so as to realize the fixed connection between the U-shaped groove mounting base and the closed-loop hole mounting base on different planes; the pedicle screw Cooperate with the pedicle screw mounting hole on the U-shaped groove mounting base, and the head of the pedicle screw matches with the ball and socket surface at the lower part of the U-shaped mounting groove, which can be rotated universally, further increasing the stability of the internal fixation angle during the operation. Select; the bottom of the retaining ring is matched with the cylindrical surface at the bottom of the U-shaped installation groove, and the upper teeth of the retaining ring are engaged with the arc-shaped groove, placed on the bottom of the U-shaped installation groove and the pedicle screws are locked up and down; the said The orthopedic rods are respectively placed in the U-shaped installation groove and the closed-loop installation hole; the double locking screw plugs include an outer locking screw plug and an inner locking screw plug, the double locking screw plugs can be locked step by step, and the outer locking screw plugs The plug can first pressurize and lock the pedicle screw, and at the same time lock the U-shaped groove mounting base and the closed-loop hole mounting base, and the inner locking screw plug locks the orthopedic rod, which is convenient for operation and installation during surgery.

In this specific embodiment, the closed-loop installation hole and the U-shaped groove are combined, and the position between the two can be adjusted according to different angle requirements. In addition to being able to flexibly design different angles, it can also be fixed. Fast installation of the system and prevention of orthopedic rods from coming out. This is because although there are many parts in the U-shaped groove, the pedicle screws and retaining rings can be installed before the operation. During the operation, you only need to put the orthopedic rod directly into the U-shaped groove from top to bottom and lock it. . This patent adopts the installation position design of the closed-loop hole at the same time. This is because the installation position of the closed-loop hole itself is a closed loop, so it can effectively prevent the prolapse of the orthopedic rod, and avoid the protruding phenomenon of the orthopedic rod in the fixing system when the stress is concentrated. The stability of the system is guaranteed.

In this specific embodiment, as shown in FIG. 6, in this specific embodiment, at least one double-head installation base is included, and in two adjacent double-head installation bases, the first base and the second base A first orthopedic rod and a second orthopedic rod are arranged between the seats, wherein one end of one of the orthopedic rods is set in the U-shaped groove of the first double-ended mounting base, and the second end of the first orthopedic rod is set in the second In the closed-loop installation hole of the double-head installation base; for the same reason, one end of the second orthopedic rod is arranged in the closed-loop installation hole of the first double-head installation base, and the other end of the second orthopedic rod is arranged in the closed-loop installation hole of the first double-head installation base. In the U-shaped groove of the above-mentioned double-head mounting base.

In this specific embodiment, through the above method, the orthopedic rod can be connected to the base fixed on the adjacent vertebral body through the U-shaped groove and the closed-loop installation hole, and the adjacent base is also connected to the next base through the orthopedic rod , so as to realize the internal fixation connection of multiple segments of the vertebral body, and the multi-rod connection avoids excessive force on a single rod, especially at the connection between the sacroiliac part and the lumbar spine. Large, excessive bending of rods is required during the operation, which will cause stress concentration and increase the risk of fracture of orthopedic rods. Excessive bending of rods is no longer needed, reducing stress concentration and shortening operation time. Moreover, the base with two installation positions and multi-rod connection are adopted. If a certain fixing screw or orthopedic rod fails, only a certain screw or a certain section of orthopedic rod needs to be replaced to facilitate secondary repair without dismantling all devices.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (5)

1. a kind of double end pedestal multi-angle plane regulating spinal internal fixation system characterized by comprising

Multiple pedestals, include at least one double end pedestal in the pedestal, double end pedestal include a U-type groove installation pedestal and One closed loop hole installation pedestal；Ball stud, the ball are set between the U-type groove installation pedestal and closed loop hole installation pedestal Hook bolt tail portion is provided with screw thread, with being threadedly engaged in the screw hole of closed loop hole installation pedestal side；The head of ball stud is Bulb, the U-type groove installation pedestal can be around the bulb frictional damping universal rotationals；

Orthopedic rod, including the first Orthopedic rod and the second Orthopedic rod, one end of first Orthopedic rod and the closed loop on double end pedestal Mounting hole is fixedly connected, and one end of the second Orthopedic rod is fixedly connected with U-type groove installation pedestal.

2. a kind of double end pedestal multi-angle plane regulating spinal internal fixation system according to claim 1, which is characterized in that The U-type groove installation pedestal includes U-type groove, and the opening upwards setting of the U-type groove, the bottom of the U-type groove is provided with one Circular through hole；The U-type groove, the bulb of the pedicle screw are stretched out in the tip of pedicle screw from the circular through-hole Cooperate with the slot bottom ball-and-socket of the U-type groove, allows the pedicle screw universal rotational.

3. a kind of double end pedestal multi-angle plane regulating spinal internal fixation system according to claim 2, which is characterized in that In the U-type groove, the top of the pedicle screw and retaining ring cooperate, and the retaining ring is one columnar structured, described The front and rear sides of cylinder upper end offer U-shaped opening, and the U-shaped opening passes through for Orthopedic rod and supports and fix and is described orthopedic Stick；Protrusion is provided in the middle part of the inner wall of the retaining ring, the protrusion and the top of the pedicle screw cooperate, by the vertebral arch The top pressing of root screw is maintained at scheduled position, thus the position of the fixed pedicle screw.

4. a kind of double end pedestal multi-angle plane regulating spinal internal fixation system according to claim 3, which is characterized in that The notch of the U-type groove installation pedestal is provided with internal screw thread；Outer locking plug screw is a cylindric plug screw, inner and outer wall On be provided with screw thread, the screw-internal thread fit of the screw thread on outer wall and notch setting passes through the rotation outer locking plug screw The position of the pedicle screw is fixed；The internal screw thread of the outer locking plug screw is matched with the screw thread on internal locking plug screw periphery It closes, screws the internal locking plug screw in this way and press the Orthopedic rod being arranged on the retaining ring, thus the position of the fixed Orthopedic rod It sets.

5. a kind of double end pedestal multi-angle plane regulating spinal internal fixation system according to claim 1, which is characterized in that Closed loop mounting hole is provided in the installation pedestal of closed loop hole, closed loop mounting hole is integrally formed closed loop and penetrates through the closed loop hole installation base The front-rear direction setting of seat, closed loop mounting hole section is small top and big bottom, and lower end is in arc-shaped, the surface phase with Orthopedic rod Match；It is provided with through-hole up and down at the top of the closed loop mounting hole, plug screw is installed in the through-hole.